Big Hill Formation
The Big Hill Formation is a geologic formation in Michigan. It preserves fossils dating back to the Ordovician period. A fossiliferous site on the Stonington Peninsula (in Delta County) includes a dolomite bed of the Big Hill Formation which has abundant and well-preserved fossils. The most common fossils are soft-bodied medusae (jellyfish), followed by linguloid brachiopods, algae, and arthropods (namely chasmataspidids, leperditid ostracods, and eurypterids). This site is considered a Konservat-Lagerstätte, and is commonly referred to as the Big Hill Lagerstätte or Big Hill Biota.
| Big Hill Formation | |
|---|---|
| Stratigraphic range: Late Ordovician | |
Jointed limestone from the Big Hill Formation (Upper Peninsula of Michigan) | |
| Type | Formation |
| Unit of | Richmond Group (geology) |
| Underlies | Manitoulin Dolomite |
| Overlies | Stonington Formation |
| Lithology | |
| Primary | limestone |
| Location | |
| Region | Michigan |
| Country | United States |
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